The independent source for health policy research, polling, and news.
KFF’s policy research provides facts and analysis on a wide range of policy issues and public programs.
KFF designs, conducts and analyzes original public opinion and survey research on Americans’ attitudes, knowledge, and experiences with the health care system to help amplify the public’s voice in major national debates.
KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the organization’s core operating programs.
This brief describes nonelderly adults with opioid use disorder, including their demographic characteristics and insurance status, and compares utilization of treatment services among those with Medicaid to those with other types of coverage. It also describes Medicaid financing for opioid treatment and the ways in which Medicaid promotes access to treatment for enrollees with OUD.
More than four years after the implementation of the Medicaid expansion included in the Affordable Care Act, debate and controversy around the implications of the expansion continue. Despite a large body of research that shows that the Medicaid expansion results in gains in coverage, improvements in access and financial security, and economic benefits for states and providers, some argue that the Medicaid expansion has broadened the program beyond its original intent diverting spending from the “truly needy”, offers poor quality and limited access to providers, and has increased state costs. New proposals allow states to implement policies never approved before including conditioning Medicaid eligibility on work or community engagement. New complex requirements run counter to the post-ACA movement of Medicaid integration with other health programs and streamlined enrollment processes. This brief examines evidence of the effects of the Medicaid expansion and some changes being implemented through waivers. Many of the findings on the effects of expansion cited in this brief are drawn from the 202 studies included in our comprehensive literature review that includes additional citations on coverage, access, and economic effects of the Medicaid expansion.
States that have expanded Medicaid under the Affordable Care Act generally have seen gains in coverage, improvements in access to and affordability of health care, and net fiscal benefits, a growing body of research and data show.
The Uninsured and the ACA: A Primer provides information on how insurance has changed under the ACA and more recent policy changes, how many people remain uninsured, who they are, and why they lack health coverage. It also summarizes what we know about the impact that a lack of insurance can have on the health outcomes and personal finances and the difference health insurance can make in people’s lives.
Large Majorities across Parties Say Medi-Cal is Important to the State; Most Residents Say Program is Important to Their Families; Access to Care Remains a Challenge for Some Enrollees Californians rank making health care more affordable among their top overall priorities for the state’s new governor and legislature, with 45 percent citing it as “extremely…
While not typically an election issue, Medicaid — particularly the Medicaid expansion created under the Affordable Care Act (ACA) — was an important issue in the 2018 midterm elections in a number of campaigns throughout the country. This fact sheet highlights key states in which the results of the 2018 midterm elections have implications for Medicaid adoption or implementation. States examined include those that had Medicaid expansion ballot initiatives as well as states that have not yet adopted or implemented expansion but elected governors who support Medicaid expansion. In these states that had gubernatorial races with implications for Medicaid expansion, it will be important to monitor changes in the composition of state legislatures, as governors in most states will need to work with their legislatures in order to adopt the expansion.
This issue brief explores the impact of COVID-19 on justice-involved populations, examines how states have prioritized these populations for vaccination, and highlights the significance of Medicaid coverage for this population as well as proposals to expand access to Medicaid coverage.
This issue brief examines how the ACA Medicaid expansion has affected racial disparities in health coverage, access to care, health outcomes, and economic outcomes.
This fact sheet summarizes the reasons why low-wage workers are less likely to have employer-sponsored health insurance than workers with higher incomes and therefore, are more likely to be uninsured.
This article, authored by Diane Rowland, Alina Salganicoff, and Patricia Keenan of the Kaiser Commission on Medicaid and the Uninsured, assesses Medicaid's contributions as a public financing program for health insurance coverage for the poor over the last three decades.
© 2026 KFF